Redux & Redux Toolkit Course
Redux & Redux Toolkit
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Intermediate

Intermediate Interview Questions

Definition

Questions testing practical experience with modern Redux, specifically Redux Toolkit and asynchronous logic.

Explain Like I'm New

The interviewer wants to know if you are stuck in 2018 writing switch statements, or if you know how to use modern RTK, Immer, and Thunks.

Real World Example

Being asked: 'How do you handle API calls in a Redux application?'

Common Use Cases

  • •Mid-level Developer Interviews

Terminal Output

bash / terminal
/* Q: Can you mutate the state directly in a Redux Reducer? A: In legacy Redux, absolutely not. You must use the spread operator to return a new immutable object. HOWEVER, in modern Redux Toolkit, YES, you can write mutating syntax like `state.value = 5`. This is because RTK uses the Immer library under the hood, which intercepts the mutation and safely generates an immutable copy behind the scenes. */

Interview Questions

basic

  • What is Redux Thunk and why is it necessary?

intermediate

  • What is the purpose of the `createSlice` function in RTK?

Flash Cards

Question

What is Thunk?

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Answer

Reducers are pure, synchronous functions. They cannot handle Promises or API calls. Thunk is a middleware that intercepts actions that are functions, allowing you to perform asynchronous logic (like `fetch`) before dispatching the final data to the reducer.

Question

Purpose of createSlice?

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Answer

It significantly reduces boilerplate. It accepts an initial state and a set of reducer functions, and it automatically generates the Action Creators and Action Types corresponding to those reducers. It also wraps the reducers in Immer, allowing safe 'mutable' syntax.